How Cal.com Rebuilt AppSec After Going Closed Source

After five years as an open-source company, Cal.com shifted to closed source in April 2026 to counter rising AI-driven security threats targeting its public code. However, this move didn't prevent new vulnerabilities from being introduced, especially as pull request volume grew from 40 to 100 daily with AI coding tools. The security team of two engineers struggled with noisy, conflicting results from multiple scanners, creating more reconciliation work than actual security. By adopting Gecko Security as a single source of truth in their pipeline, Cal.com gained context-aware scanning that provided working proofs of concept and prioritized real risk over raw severity. Gecko routes findings directly to code owners, stores triage comments to refine future fixes, and integrates security into the engineering workflow. This predictable, continuous process allows a 25-person team to achieve robust security coverage without slowing development, turning the challenge of AI-accelerated attacks into a sustainable security program. 

https://gecko.security/blog/how-cal-com-rebuilt-appsec-after-going-closed-source

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